[heap] Do not invoke GC to make heap iterable.

src/profiler/heap-snapshot-generator.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PROFILER_HEAP_SNAPSHOT_GENERATOR_H_
 #define V8_PROFILER_HEAP_SNAPSHOT_GENERATOR_H_
 
 #include "include/v8-profiler.h"
 #include "src/base/platform/time.h"
 #include "src/objects.h"
 #include "src/profiler/strings-storage.h"
 
 namespace v8 {
 namespace internal {
 
 class AllocationTracker;
 class AllocationTraceNode;
 class HeapEntry;
 class HeapIterator;
 class HeapProfiler;
 class HeapSnapshot;
+enum class HeapObjectsFiltering;
 class SnapshotFiller;
 
 class HeapGraphEdge BASE_EMBEDDED {
  public:
   enum Type {
     kContextVariable = v8::HeapGraphEdge::kContextVariable,
     kElement = v8::HeapGraphEdge::kElement,
     kProperty = v8::HeapGraphEdge::kProperty,
     kInternal = v8::HeapGraphEdge::kInternal,
     kHidden = v8::HeapGraphEdge::kHidden,
@@ skipping 324 matching lines @@
 
   void MarkVisitedField(HeapObject* obj, int offset);
 
   HeapEntry* AddEntry(HeapObject* object);
   HeapEntry* AddEntry(HeapObject* object,
                       HeapEntry::Type type,
                       const char* name);
 
   const char* GetSystemEntryName(HeapObject* object);
 
-  template<V8HeapExplorer::ExtractReferencesMethod extractor>
-  bool IterateAndExtractSinglePass();
+  template <V8HeapExplorer::ExtractReferencesMethod extractor>
+  bool IterateAndExtractSinglePass(HeapObjectsFiltering filtering);
 
   bool ExtractReferencesPass1(int entry, HeapObject* obj);
   bool ExtractReferencesPass2(int entry, HeapObject* obj);
   void ExtractJSGlobalProxyReferences(int entry, JSGlobalProxy* proxy);
   void ExtractJSObjectReferences(int entry, JSObject* js_obj);
   void ExtractStringReferences(int entry, String* obj);
   void ExtractSymbolReferences(int entry, Symbol* symbol);
   void ExtractJSCollectionReferences(int entry, JSCollection* collection);
   void ExtractJSWeakCollectionReferences(int entry,
                                          JSWeakCollection* collection);
@@ skipping 240 matching lines @@
   friend class HeapSnapshotJSONSerializerIterator;
 
   DISALLOW_COPY_AND_ASSIGN(HeapSnapshotJSONSerializer);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PROFILER_HEAP_SNAPSHOT_GENERATOR_H_